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university of Provence - Aix-Marseille I |  |
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university of Provence - Aix-Marseille I | |
| HAL: halsde-00719973, version 1 |
| DOI: 10.1016/j.yqres.2012.03.003 |
| Detailed view |  Export this paper |
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| Quaternary Research 78 (2012) p.1-12 |
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| 1400 years of extreme precipitation patterns over the Mediterranean French Alps and possible forcing mechanisms |
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| Bruno Wilhelm 1Fabien Arnaud 1 |
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| (2012) |
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| Investigation of Lake Allos sediments revealed ~ 160 graded layers, interpreted as flood deposits, over the last 1400 yr. Comparisons with records of historic floods support the interpretation of flood deposits and suggest that most recorded flood events are the result of intense meso-scale precipitation events. As there is no evidence for any major changes in erosion processes in the catchment since the Medieval Warm Period (MWP), we interpret the Allos record in terms of repeated intense precipitation events over the last millennium, with a low flood frequency during the MWP and more frequent and more intense events during the Little Ice Age. This interpretation is consistent with the pattern of increasingly humid conditions in the northwestern Mediterranean region. This long-term trend is superimposed on high frequency oscillations that correlate with solar activity and autumnal North Atlantic Oscillation (NAO). Finally, a comparison of flood records across the northwestern Mediterranean region showed that intense precipitation events in Allos (east of the Rhône Valley) were out of phase with events in the Cévennes (west of the Rhône) but in phase with events in eastern Spain. Supported by meteorological analyses, this suggests an oscillation in atmospheric circulation patterns over the northwestern Mediterranean. |
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| 1: | Environnements, Dynamiques et Territoires de la Montagne (EDYTEM) |
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CNRS : UMR5204 – Université de Savoie |
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| 2: | Institut des sciences de la Terre (ISTerre) |
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CNRS : UMR5275 – IFSTTAR – Université de Savoie – Université Joseph Fourier - Grenoble I – INSU – OSUG – Institut de recherche pour le développement [IRD] : UR219 |
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| 3: | Centre européen de recherche et d'enseignement de géosciences de l'environnement (CEREGE) |
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CNRS : UMR6635 – Institut de recherche pour le développement [IRD] – INSU – Université de Provence - Aix-Marseille I – Université Paul Cézanne - Aix-Marseille III |
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| 4: | Institut méditerranéen de biodiversité et d'écologie marine et continentale (IMBE) |
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CNRS : UMR7263 – Aix-Marseille Université - AMU – Institut de recherche pour le développement [IRD] : UMR237 – INEE – INSU – INSB |
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| 5: | Littoral, Environnement et Sociétés (LIENSs) |
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Université de La Rochelle – CNRS : UMR6250 |
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| 6: | Institut des Sciences de la Terre d'Orléans (ISTO) |
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Université d'Orléans – CNRS : UMR7327 – INSU – Bureau de Recherches Géologiques et Minières (BRGM) |
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| 7: | Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE) |
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CNRS : UMR8212 – CEA : DSM/LSCE – Université de Versailles Saint-Quentin-en-Yvelines |
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| subject | : | Environmental Sciences/Global Changes |
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| Paleoflood – Flood intensity – Last millennium – Mediterranean climate – Solar activity – North Atlantic Oscillation |
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| Attached file list to this document: | |||||
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| halsde-00719973, version 1 | |
| http://hal-sde.archives-ouvertes.fr/halsde-00719973 | |
| oai:hal-sde.archives-ouvertes.fr:halsde-00719973 | |
| From: Christine Maury | |
| Submitted on: Friday, 17 May 2013 15:48:56 | |
| Updated on: Sunday, 19 May 2013 09:10:30 | |
